scholarly journals Reference governor for Network Control Systems subject to variable time-delay

Automatica ◽  
2015 ◽  
Vol 62 ◽  
pp. 77-86 ◽  
Author(s):  
Stefano Di Cairano ◽  
Uroš V. Kalabić ◽  
Ilya V. Kolmanovsky
Keyword(s):  
Time Delay ◽  
Control Systems ◽  
Network Control ◽  
Variable Time Delay ◽  
Variable Time ◽  
Network Control Systems ◽  
Reference Governor

Input-to-state stability of discrete time-delay systems with switching and impulsive signals

2018 ◽  
Vol 40 (15) ◽  
pp. 4175-4184 ◽  
Author(s):  
Zhengbao Cao ◽  
Lijun Gao ◽  
Meng Zhang
Keyword(s):  
Time Delay ◽  
Control Systems ◽  
Discrete Time ◽  
Discrete Systems ◽  
Network Control ◽  
Delay Systems ◽  
Time Delay Systems ◽  
Delay Bound ◽  
Discrete Time Delay ◽  
Network Control Systems

This paper investigates input-to-state stability (ISS) for a class of discrete time-delay systems with switching and impulsive signals. By the Lyapunov–Krasovskii technique, a dwell-time bound and delay bound are clearly presented to contribute to the ISS for discrete time-delay systems. A significant subsequence method of the switched and impulsive sequence will firstly be applied to study the ISS of discrete systems. Based on this method, some new conditions guaranteeing ISS are presented. Compared with the existing results on related problems, the obtained stability criteria are less conservative as it is only required for the specially designed Lyapunov function to be non-increasing along each of the defined subsequences of the switched and impulsive time. Examples of network control systems are presented to illustrate the main results at the end.

The Stability Conditions Evaluation of Network Control System Based on Double Time Delay Discrete Model

2013 ◽  
Vol 846-847 ◽  
pp. 112-115
Author(s):  
Ling Ding ◽  
Ping Fan ◽  
Bin Wen
Keyword(s):  
Control System ◽  
Time Delay ◽  
Control Systems ◽  
Discrete Model ◽  
Network Control ◽  
System Stability ◽  
Stability Conditions ◽  
Network Control System ◽  
Network Control Systems ◽  
The Stability

The current study of network control stability system has become a very hot topic, the stability conditions of network control systems have also carried out the relevant research on double delay discrete model, its main target to the current actual situation, which carries out the related stability for network control systems with state time-delay. This paper uses the relevant stability theory, the sufficient condition of network control system stability are described under the time-delay discrete model, on the basis of relevant transformation, completing the evaluation for the network control system stability condition of double delay discrete model. Finally, through the relevant data, to carry on its effectiveness validated. The method has certain reference significance for the stability study of similar system, and provides a theoretical reference for the research on this problem.

scholarly journals On Adaptive Moving Average Algorithms for the Application of the Conservative Power Theory in Systems with Variable Frequency

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1201
Author(s):  
Daniel dos Santos Mota ◽  
Elisabetta Tedeschi
Keyword(s):  
Time Delay ◽  
Moving Average ◽  
Voltage Source ◽  
Moving Averages ◽  
Nonlinear Load ◽  
Power Theory ◽  
Variable Time Delay ◽  
Variable Time ◽  
Conservative Power Theory ◽  
Conservative Power

The Conservative Power Theory (CPT) emerged in recent decades as a theoretical framework for coping with harmonically distorted and unbalanced electric networks of ac power systems with a high participation of converter interfaced loads and generation. The CPT measurements are intrinsically linked to moving averages (MA) over one period of the grid. If the CPT is to be used in a low-inertia isolated-grid scenario, which is subjected to frequency variations, adaptive moving averages (AMA) are necessary. This paper reviews an efficient way of computing MAs and turns it into an adaptive one. It shows that an easily available variable time delay block, from MATLAB, causes steady-state errors in the measurements when the grid frequency varies. A new variable time delay block is, thus, proposed. Nonetheless, natural pulsations in the instantaneous power slip through MAs when the discrete moving average window does not fit perfectly the continuously varying period of the grid. A method consisting of weighing two MAs is reviewed and a new and effective hybrid AMA is proposed. The CPT transducers with the different choices of AMAs are compared via computer simulations of a single-phase voltage source feeding either a linear or a nonlinear load.

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